utilizing the resources of the web in educational practices has made instructional processes more efficient and interesting and has made the learning process on the other hand much easier and attractive. with the web, english language teachers now have the option of engaging learners in online (web-based) instructions in addition to the use of conventional classroom instructions or alternativel...

the internet is already the primary source of tourist destination information for travelers. according to world tourism organization, about 95% of web users use the internet to gather travel related information and about 93% indicate that they visited tourism web sites when planning for vacations. the number of people turning to the internet for vacation and travel planning has increased more t...

the effect of steel plate thickness on the repair effectiveness of rc beam is presented in this paper. a total of four beams were tested, one beam repaired by cfrp with a thickness of 1.2 mm and used as a control beam, and three beams repaired by a steel plate. steel plates with a thickness of 2 mm, 3 mm, and 4 mm were used in repairing the beams. the maximum load-carrying capacity, deflection ...

background: governance is one of the main functions of health research system (hrs) that consist of four essential elements such as setting up evaluation system. the goal of this study was to introduce a new web based research evaluation model in iran. methods: based on main elements of governance, research indicators have been clarified and with cooperation of technical team, appropriate softw...

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Data mining applications have recently required a large amount of high-dimensional data. However, most clustering methods for the data miming applications do not work efficiently for dealing with large, high-dimensional data because of the so-called ‘curse of dimensionality’ [1] and the limitation of available memory. In this paper, we propose an efficient cell-based clustering method for handl...

BACKGROUND Membranous nephropathy (MN), the leading cause of nephrotic syndrome in adults, is characterized by the deposition of subepithelial immune deposits. Most of the cases are primary, while only approximately 25% of the cases are secondary to some known diseases. Recently, MN has been considered to be a possible presentation of chronic graft-versus-host disease (GVHD) of the kidney in al...

The goal of our work is to model believable virtual actors. Within the framework of learning by imitation, the virtual actor must be able to modify its prototypic behavior for miming in its imaginary world the observed behavior of a model which can be another virtual actor or an avatar controlled by a human operator. Each virtual actor has sensors for perceiving and effectors for acting and als...

Science, a weekly journal, is published each Friday by the American Association for the Advancement of Science at Mt. Royal & Guilford Avenues, Baltimore 2, Maryland. Founded in 1880, it has beensince 10oo the official publication of the AAAS. Editorial, Advertising, and Circulation Offices, 1515 Massachusetts Avenue, N.W., Washington 5, D. C. Telephone, EXecutive W60 or 6061. Cable address SCI...